Coding Standards: Remove redundant check in wpdb::set_sql_mode().

This commit removes an unnecessary `empty( $modes_str )` check, as the previous code block already checks the same value and returns early.

Follow-up to [30587], [56475].

Props justlevine.
See #64238.
Built from https://develop.svn.wordpress.org/trunk@61243


git-svn-id: http://core.svn.wordpress.org/trunk@60555 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wpdb.php

@@ -960,13 +960,7 @@ class wpdb {
 				return;
 			}
 
-			$modes_str = $modes_array[0];
-
-			if ( empty( $modes_str ) ) {
-				return;
-			}
-
-			$modes = explode( ',', $modes_str );
+			$modes = explode( ',', $modes_array[0] );
 		}
 
 		$modes = array_change_key_case( $modes, CASE_UPPER );

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-alpha-61225';
+$wp_version = '7.0-alpha-61243';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.